1 行正则去除重复字符或者重复单词

gistfile1.js

//去除重复字符
var str='aabbaabbcddcabcadbcad';
var str2=str.replace(/(.)(?=.*\1)/g,'');
document.writeln(str2); //bcad

//去除重复单词
var str='one two two one two one 99 two 99';
var str2=str.replace(/(\b\w+\b) (?=.*\1)/g,'');
document.writeln(str2); //one two 99